Space / Slash / Break sends E04A if Ctrl is not pressed. If Ctrl
is pressed it sends E07E E0F07E on press and nothing on release.

These scancodes are expected to be translated by the keyboard controller,
producing the same output that you'd get from (untranslated) Set 1:

Set 3

Set 3 uses the same position-based coding as the
122-key terminal keyboards and the
84-key AT keyboard. It is the only set to
distinguish between the key position above Return (where Backslash is on a
101-key keyboard) and the one to the left of Return (where Hash is on a
102-key keyboard).

Notes:

Only the keys highlighted in grey return break codes (F0 xx).

Compared to a 102-key keyboard, some keys have different Set 3
scancodes. For example, on a 102-key keyboard PgUp and PgDn have
the set 3 scancodes 6F and 6D, respectively. On a 122-key keyboard
they have set 3 scancodes 6E and 6F, because they're in different
places.

The "Key position" columns are an indication of position rather
than keycap.

Keys where the set 1 / 2 scancode differs between the 122-key
keyboard and a normal 101 / 102-key keyboard are
highlighted.

Set 3 code

Translated Set 3 code

122-key

101 / 102-key

Key position

Set 2 code

Set 1 code

Key position

Set 2 code

Set 1 code

01

43

F9 (left function key block)

5C

75

02

--

Not assigned (why?)

--

--

03

3F

F5 (left function key block)

53

74

04

3D

F3 (left function key block)

39

72

05

3B

F1 (left function key block)

19 / 84

71 / 54

06

3C

F2 (left function key block)

5F

76

07

58

F1 (top function key block)

05

3B

same

05

3B

08

64

F13 (top function key block)

1F

5B

Esc

76

01

09

44

F10 (left function key block)

48

6C

0A

42

F8 (left function key block)

6F

6F

0B

40

F6 (left function key block)

50

6D

0C

3E

F4 (left function key block)

77 / E177

45 / E145

0D

0F

Tab

0D

0F

same

0D

0F

0E

29

Key to the left of 1

0E

29

same

0E

29

0F

59

F2 (top function key block)

06

3C

same

06

3C

10

65

F14 (top function key block)

27

5C

11

38

Left Ctrl

14

1D

same

14

1D

12

2A

Left Shift

12

2A

same

12

2A

13

70

\ (if adjacent to left Shift)

61

56

same

61

56

14

1D

Caps Lock

58

3A

same

58

3A

15

10

Q

15

10

same

15

10

16

02

1

16

02

same

16

02

17

5A

F3 (top function key block)

04

3D

same

04

3D

18

66

F15 (top function key block)

5E

5D

19

71

Left Alt

11

38

same

11

38

1A

2C

Z

1A

2C

same

1A

2C

1B

1F

S

1B

1F

same

1B

1F

1C

1E

A

1C

1E

same

1C

1E

1D

11

W

1D

11

same

1D

11

1E

03

2

1E

03

same

1E

03

1F

5B

F4 (top function key block)

0C

3E

same

0C

3E

20

67

F16 (top function key block)

5E

63

21

2E

C

21

2E

same

21

2E

22

2D

X

22

2D

same

22

2D

23

20

D

23

20

same

23

20

24

12

E

24

12

same

24

12

25

05

4

25

05

same

25

05

26

04

3

26

04

same

26

04

27

5C

F5 (top function key block)

03

3F

same

03

3F

28

68

F17 (top function key block)

08

64

29

39

Spacebar

29

39

same

29

39

2A

2F

V

2A

2F

same

2A

2F

2B

21

F

2B

21

same

2B

21

2C

14

T

2C

14

same

2C

14

2D

13

R

2D

13

same

2D

13

2E

06

5

2E

06

same

2E

06

2F

5D

F6 (top function key block)

0B

40

same

0B

40

30

69

F18 (top function key block)

10

65

31

31

N

31

31

same

31

31

32

30

B

32

30

same

32

30

33

23

H

33

23

same

33

23

34

22

G

34

22

same

34

22

35

15

Y

35

15

same

35

15

36

07

6

36

07

same

36

07

37

5E

F7 (top function key block)

83

41

same

83

41

38

6A

F19 (top function key block)

18

66

39

72

Right Alt

E011

E038

same

E011

E038

3A

32

M

3A

32

same

3A

32

3B

24

J

3B

24

same

3B

24

3C

16

U

3C

16

same

3C

3D

08

7

3D

08

same

3D

08

3E

09

8

3E

09

same

3E

09

3F

5F

F8 (top function key block)

0A

42

same

0A

42

40

6B

F20 (top function key block)

20

67

41

33

<

41

33

same

41

33

42

25

K

42

25

same

42

25

43

17

I

43

17

same

43

17

44

18

O

44

18

same

44

18

45

0B

0

45

0B

same

45

0B

46

0A

9

46

0A

same

46

0A

47

60

F9 (top function key block)

01

43

same

01

43

48

6C

F21 (top function key block)

28

68

49

34

>

49

34

same

49

34

4A

35

?

4A

35

same

4A

35

4B

26

L

4B

26

same

4B

26

4C

27

:

4C

27

same

4C

27

4D

19

P

4D

19

same

4D

19

4E

0C

-

4E

0C

same

4E

0C

4F

61

F10 (top function key block)

09

44

same

09

44

50

6D

F22 (top function key block)

30

69

51

73

Unused position under right Shift

51

73

same

51

73

52

28

@

52

28

same

52

28

53

74

\ (if adjacent to Enter)

5D

2B

same

5D

2B

54

1A

[

54

1A

same

54

1A

55

0D

+

55

0D

same

55

0D

56

62

F11 (top function key block)

78

57

same

78

57

57

6E

F23 (top function key block)

40

6A

Print Screen / SysRQ

E07C / 84

E037 / 54

58

3A

Right Ctrl

E014

E01D

same

E014

E01D

59

36

Right Shift

59

36

same

59

36

5A

1C

Enter

5A

1C

same

5A

1C

5B

1B

]

5B

1B

same

5B

1B

5C

75

\ (if above Enter)

5D

2B

same

5D

2B

5D

2B

\ (if adjacent to Backspace)

6A

7D

same

6A

7D

5E

63

F12 (top function key block)

07

58

same

07

58

5F

76

F24 (top function key block)

40

6B

Scroll Lock

7E

46

60

55

Cursor down

E072

E050

same

E072

E050

61

56

Cursor left

E06B

E04B

same

E06B

E04B

62

77

Key between cursor keys

E06C

E047

Pause / Break

77 / E07E

45 / E046

63

78

Cursor up

E075

E048

same

E075

E048

64

79

3x2 block, lower row, left column
(End)

E069

E04F

(Delete)

E071

E053

65

7A

3x2 block, lower row, middle
column (Insert)

E070

E052

(End)

E069

E04F

66

0E

Backspace

66

0E

same

66

0E

67

7B

3x2 block, upper row, left column
(PA1)

17

5A

(Insert)

E070

E052

68

7C

Unused position under keypad 0

68

7C

same

68

7C

69

4F

Keypad 1

69

4F

same

69

4F

6A

7D

Cursor right

E074

E04D

same

E074

E04D

6B

4B

Keypad 4

6B

4B

same

6B

4B

6C

47

Keypad 7

6C

47

same

6C

47

6D

7E

3x2 block, lower row, right column
(Delete)

E071

E053

(PgDn)

E07A

E051

6E

7F

3x2 block, upper row, middle column
(PgUp)

E07D

E049

(Home)

E06C

E047

6F

6F

3x2 block, upper row, right column
(PgDn)

E07A

E051

(PgUp)

E07D

E049

70

52

Keypad 0

70

52

same

70

52

71

53

Keypad .

71

53

same

71

53

72

50

Keypad 2

72

50

same

72

50

73

4C

Keypad 5

73

4C

same

73

4C

74

4D

Keypad 6

74

4D

same

74

4D

75

48

Keypad 8

75

48

same

75

48

76

01

Keypad top left corner
(Esc)

76

01

(Num Lock)

77

46

77

45

Keypad top row, second
column (NumLk / ScrLk)

7E / 77

46 / 45

(Keypad /)

E04A

E035

78

57

Unused position under
keypad Enter

63

78

same

63

78

79

4E

Keypad Enter

E05A

E01C

same

E05A

E01C

7A

51

Keypad 3

7A

51

same

7A

51

7B

4A

Keypad -

7B

4A

Unused position under Keypad +

6D

7E

7C

37

Keypad +

79

4E

same

79

4E

7D

49

Keypad 9

7D

49

same

7D

49

7E

46

Keypad top row, third column (*)

7C

37

same

7C

37

83

41

F7 (left function key block)

E07C

E037

84

54

Keypad top right hand corner (/)

E04A / E07E

E035 / E046

(keypad -)

7B

4A

And the following three aren't present on
the 122-key board, but are included for
completeness:

8B

8B

Left Windows

E01F

E05B

8C

8C

Right Windows

E027

E05C

8D

8D

Menu

E02F

E05D

A minor oddity: A 122-key IBM board in set 3 can return 127 scancodes.
These are all in a nice consecutive 7-bit range, except for two. The key that
(from diagrams) you'd expect to send 02h, sends 83h. And the 7Fh key sends
84h. If the microcontroller on the motherboard is translating scancodes, it
treats these pairs as identical: both 02h and 83h get mapped to 41h, and both
7Fh and 84h get mapped to 54h.

Possibly these two keys had some special meaning on the 3270-series
terminals where set 3 scancodes seem to have originated.

Under Windows NT / 2000 / XP

The extra keys (F13-F24 and so on) return scancodes under Windows NT 3.5
and later. However, the VK_ codes they use do not match the keycaps.
This can be corrected with replacement layout DLLs. Suitable US/UK files
are available here, with instructions
how to generate your own in other languages.

Under Linux

The following scripts allow the extra keys to be used under Linux (tested
on Ubuntu 9.10, in X11):

keycodes_1227t: Assigns Linux keycodes to the
extra keys. Put this in (say) /usr/local/sbin:

sudo install -m 755 keycodes_1227t /usr/local/sbin

and then add a line to /etc/rc.local to call it, just before the "exit 0":

# By default this script does nothing.

/usr/local/sbin/keycodes_1227t
exit 0

xmodmap should be saved in your home directory and
renamed to .Xmodmap, with a leading dot and a capital X. The
next time you log in, you should be asked whether to load the file. Highlight
the ".Xmodmap" file and click "Load".

You will probably also need to add the option atkbd.softraw=0 to
the kernel command line. Edit /boot/grub/menu.lst and add it
to the end of the line that starts kernel.

If this worked, you should be able to run xev and see keypresses
on the extra keys being detected.